Deep-well fishing tool



Oct. 27, 1925- 5. B. DURBIN m zsr WELL r'rsame 1001.

Filed Kay 21. 1925.

Patented Got. 27, 192?.

saMUEI; 3. Domain, "or W'IULSA, LAHOMA.

. DEEP-WELL FISHING 'roon' Application filed my 21, 192 5. ,sri'a1 at, 31,881,

To all whom it may concern:

- Be it known that I, SAMUEL B. DURBIN, a citizen of. the United States, residing at Tulsa, in the county of Tulsa and Stateof Oklahoma, have invented certain new and useful Improvementsin DeepWVell Fishing Tools, of which the following is a specification, reference being hadto the accompany ing drawings.

This invention relates to .d'eep well fishing tools and more'particularly to a sucker rod extractor. v An important object of this invention is to provide a device of this character which is particularly adapted for removing from the well broken sections of sucker rod or tubing having a one piece slip barrel within which are arranged a pluralityof sets of f slips together with a single spring, the slips being so constructed that when any particular set of slips is in operation, it is urged downwardly by" this single spring to its lockingposit-ion. V 1 r A further object f the invention is. to provide a device of this character whereby the removal of such single spring or rather of the seat against which the upper end of the spring engagesywill release all of the slips, thus permitting the slips to be dis engaged from a rodwhich'has been elevated from the well; p I A further object of the invention is to provide a slip socket so constructed that it is readily possible to cleanly break the hold of the slips upon the engaged .elementfn The invention further resides in the method of constructing the slips themselvesand in the details of construction of the slip socket.

,- Referring now more particularly to the drawings and wherein for theq purpose of illustration is shown a preferred embodis mentof my invention and wherein: Figure 1 is a vertical sectional view through afishing tool constructed inaccordance withmy invention showing the parts in the .positions which they assume as the vdevice isloweredintothe well;

: Figure-2 is a similar view illustrating one position assumed by the parts in grasping a tube or rod. Y H I In the drawings, the numeral 10 generally designates a tube socket, the upperend of avhichis interiorly threaded, asat lli- Below this threaded portion, theinternaldiaineter of the socket is: increased, asat 12, for a purpose presently toappear. This in- OIGHJSQIII diameter is extended through a,

distance slightlyless than the length of the slips to be employed in the socket and below this enlarged portion, thetrue bore 13 of the socket tapers downwardly toward its lower- .end with; a uniform taper. At this lower'en'd the bottom face of the wall is inclined outwardly and downwardly, asindis cated at. 14, so, as togprovide a funnel mouth leading to this bore With the upper end of the tube socket is engaged a .cap15 having at: i tsupper end means whereby it may be attached to afishing line, as at16, and at its lowerend a threaded pin 17 for engagement in the threaded upper end 11 of the socket. The pin hasa bore 18, the upper end of which has i a transversely extending outlet 19 openingthro-ugh the side wall of the cap. This side wall. is provided with {wrench squares 20=so that the cap may be readily applied and removed.

Arranged hin' the tubesocket e -a pair of slip units 21, 22, hereinafter referred to asthe upper and lower slip :units' respectively, The exterior surfaces of the slips of the upper and lower unitshave .exactly'the sametaper but the slips off the lower imit have less circumferential- Width than the slips of the upper unit so in their closely combined form, they will drop-further into the reducing tapered bore 13 than the slips of the upper slip unit, Tlie slips 23 of; the lower slip unit which are preferably three in number are each formed on 'one vertical edge with :an upwardly facing ,,shoulder 2 4 and' upon theopposite verticalf edgei with] a downwardly facing shoulder 25 so that each sliphas aportion he tapered bore 13 of are of, suflicient breadth to preventdisengagement thereofwhen the lower sliphnit assumes its highest position within the tapered bore, thus insuring simultaneous upward movement of allof'the slips of this slip unit. The upper end' of the lower slip unit is reduced to form an extension 26. -The;

body of the slip unit has a bore .27 which tapers upwardly and each of theseslips has its inner face provided with teethjfor en.- gagementi-with, theclement to' be grasped,

The reduced extension 26 has an upwardly tapered bore 23 reduced as regards the tapered bore 27 and at which the slips are likewise provided with gripping teeth.

Since the body of the lower slip unit is relatively long, it will be .Qbvious' that the toothed tapered bore thereof will accommodate several different sizes of tubes or rodi, this being particularly true when it is noted that the bore 13 tapers upwardly and accordingly as the lower slip unit moves upwardly, it will permit this slip unit to expand so that its lower end may engage a larger element that would not enter the lower end of the bore 27 When the slip unit is in its lowermost or normal position. A size which will enter the bore at the lower end but will not pass through the upper end of the taper 27 will be engaged when the unit is moved upwardly a. slight distance to permit an expansion of the slips 23 and a corresponding enlargement of the bore 27. In other words, the operation of the slip unit is that generally provided in the slips of such devices. H

The upper slip socket preferably likewise consists of three slips 29, these slips, however, having straight sides 30 since the esca c of any of the slips of the upper unit of tie socket is prevented by the lower end slip unit 22. The lower end of the slip unit 21 has a depending skirt 31 seating upon the upwardly facing shoulder 32 formed by the reduction of the upper end of the lower slip unit. The upper slip unit has an upwardly tapering bore 33, the lower end of which is of less diameter than the bore 28 of the reduced extension of the lower slip unit and the lower face of the units between the upper edge of the skirt and this bore is inclined downwardly andoutwardly, as indicated at 34:, to provide a funnel mouth guiding a small tube or rod into the bore33. v

The upper end of the upper slip unit is externally reduced, as at 35, to thereby produce an upwardly facing shoulder 36 forming a seat for the lower end of a spring 37, the upper end of which abuts "the lower end of, the pin 17 so that this spring exercises a constant pressure forcing the upper slips downwardly and through these upper slips likewise forcing the lower slips downwardly to their lowermost position. The lower slips in their lowermost position provide a. check upon the downward movement of the upper slips and the de-vice, as it is lowered into a well, accordingly. appears as in Figure 1. Assuming that the rod or tube to be grasped is (if such diameter that itjmust be engaged by the lower ends of the slips 23 when the device comes into engagement with "the rod, the r 14 introduces the rod into the bore V I 3'82 it come intt engagement with the slips-2'3 and tease the lower slip unit-22 to move upwardly a short distance. After the rod has been fully entered in the socket, the socket is elevated and the downward movement of the lower slip unit by the spring 37 through the upper slip unit 21 will cause the rod to be grasped for elevation. A similar action takes place when a rod is to be engaged which may not be grasped by the toothed walls of the bore 27 but must be grasped by the walls of the bore 28. In event such a rod is entered too far through the bore 28 and engages the lower face 34: of the upper slip unit, the parts will assume a position substantially as shown in Figure 2- before elevation of the socket begins.

In this figure, it will be noted that while the spring no longer supplies pressure to the slip unit- 22,-it is supplying pressure a ainst the upper end of the rod and it will a so be noted that the slips 23 are moved downwardly by gravity until the toothed walls of the bore 28 are engaged with the rod. It will be readily seen that as elevation of the tube socket takes place, the movement of the rod downwardly will cause the teeth to more firmly engage and that the pressure supplied to the upper end of the rod will maintain this firm engagement during the elevation of the rod as any movements supplied to the rod once these teeth come into engagement therewith is imparted to the slips of the. lower unit 22., A smaller rod than those above described will, of course, pass through the lower unit, leaving it undisturbed and will shift the upper unit upwardly a sufficient distance to permit this engagement. After the rod has been grasped and the device brought to the surface, by removing the cap 15, the pressure of the spring upon the rods is released and the entire socket may be moved downwardly until the engaged slips are completely released from their hold upon the Same.

I am aware that multiple slip sockets have been produced but inv all of these sockets with which I am familiar, a. separate tape-red bore is provided for each of the slip units and the use of a separate spring for each slip .unit is: also quite common. This renders the structure much more diiiicult to produce and much more costly to maintain in operation for the severed loads and working conditions to which devices of this character are subjected apply such tremendous strains thereto that the slips are constantly wearing out and the springs thereof are broken. Accordingly, a device of this character having a very small nuanber of parts is necessary to efiicie'nt operation. I do not claim broadly the use of a slip socket having a plurality'of slip units therein, but

1 claim: a 1. In ad'ee'p wen fishing tool,

s p seathaving an elongated downwardly tapering internal bore, a plurality of separate and independently movable slip units mounted in said bore and a single spring urging all of said slip units downwardly.

2. In a deep well fishing tool, a slip socket having an elongated downwardly tapering internal bore, a plurality, of slip units mounted in said bore and a single spring urging all of said slip units downwardly, said slip units each comprising a plurality of slip sections, the slip sections of the lower units having engagement one with the other whereby engagement of one of the slips of the unit causes simultaneous movement of allof the slips of the unit, the upper slip unit having at its lower end a flange seating upon the upper end of the lower slip unit.

3. In a deep well fishing tool, a slip socket having an elongated downwardly tapering internal bore, a pluralityof slip units mounted in said bore and a single spring urging all of said slip units downwardly, said slip units each comprisinga plurality of slip sections, the slip sections of the lower unit having engagement one with the other whereby engagement of one of the slips of the unit causes simultaneous movement of all of the slips of the unit, the upper slip unit having at its lower end a flange seating upon the upper end of the lower slip unit, the upper end of the lower slip unit having a reduced extension provided with a reduced bore, said reduced extension pronamed bore, the upper slip unit having an upwardly tapering bore having its greatest diameter of a smaller diameter than the diameter of such reduced bore of the lower slip unit.

5. In a deep well fishing tool, a slip socket having an elongated downwardly tapering internal bore, a plurality of slip units mounted in said bore and a single spring urging all of said slip units downwardly, the lower slip units having an upwardly tapering bore at its lower end and a reduced upwardly tapering bore at its upper end and communicating with the first named bore, the upper slip unit having an upwardly tapering bore having its greatest diameter of a smaller diameter than the diameter of such reduced bore of the lower slip unit, the lower end. of the upper slip unit being formed to provide a funnel mouth directing a rod or pipe into the bore thereof.

In testimony whereof I hereunto affix my signature.

SAMUEL B. DURBIN. 

